Fix problem with missing backend icon for created sessions

src/cantor.cpp

@@ -351,6 +351,9 @@ void CantorShell::addWorksheet(const QString& backendName)
             // Setting focus on worksheet view, because Qt clear focus of added widget inside addTab
             // This fix https://bugs.kde.org/show_bug.cgi?id=395976
             part->widget()->findChild<QGraphicsView*>()->setFocus();
+
+            // Force run updateCaption for getting proper backend icon
+            QMetaObject::invokeMethod(part, "updateCaption");
         }
         else
         {
@@ -405,12 +408,11 @@ void CantorShell::activateWorksheet(int index)
 
 void CantorShell::setTabCaption(const QString& caption, const QIcon& icon)
 {
-    if (caption.isEmpty()) return;
-
     KParts::ReadWritePart* part=dynamic_cast<KParts::ReadWritePart*>(sender());
     if (part)
     {
-        m_tabWidget->setTabText(m_tabWidget->indexOf(part->widget()), caption);
+        if (!caption.isEmpty())
+            m_tabWidget->setTabText(m_tabWidget->indexOf(part->widget()), caption);
         m_tabWidget->setTabIcon(m_tabWidget->indexOf(part->widget()), icon);
     }
 }

src/cantor_part.cpp

@@ -724,11 +724,11 @@ void CantorPart::updateCaption()
     //strip away the extension
     filename=filename.left(filename.lastIndexOf(QLatin1Char('.')));
 
-    if (filename.isEmpty())
-        filename = i18n("Unnamed");
-
     if (!m_worksheet->isReadOnly())
-        emit setCaption(filename, QIcon::fromTheme(m_worksheet->session()->backend()->icon()));
+    {
+        if (m_worksheet->session())
+            emit setCaption(filename, QIcon::fromTheme(m_worksheet->session()->backend()->icon()));
+    }
     else
         emit setCaption(filename+QLatin1Char(' ') + i18n("[read-only]"), QIcon());
 }

src/cantor_part.h

@@ -84,6 +84,9 @@ Q_SIGNALS:
     void showHelp(const QString& help);
     void worksheetSave(const QUrl& url);
 
+public Q_SLOTS:
+    void updateCaption();
+
 protected:
     /**
      * This must be implemented by each part
@@ -123,7 +126,6 @@ protected Q_SLOTS:
     void worksheetSessionLoginStarted();
     void worksheetSessionLoginDone();
     void initialized();
-    void updateCaption();
 
     void pluginsChanged();
     void runCommand(const QString& value);